package com.itheima.controller;

import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.pojo.*;
import com.itheima.service.DeptService;
import com.itheima.service.EmpService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

@Slf4j
@RestController
@RequestMapping("/emps")
public class EmpController {
    @Autowired
    private EmpService empService;
    @Autowired
    private DeptService deptService;

    @GetMapping
    public Result page(EmpQueryParam param) {
        log.info("员工列表查询条件：{}", param);
        // 调用Service层查询分页数据
        Page<Emp> empPage = new Page<>(param.getPage(), param.getPageSize());
        //按照更新时间进行排序
        empPage.addOrder(OrderItem.desc("update_time"));
        LambdaUpdateWrapper<Emp> luw = new LambdaUpdateWrapper<>();
        luw.like(param.getName() != null && param.getName().length() > 0, Emp::getName, param.getName());
        luw.eq(param.getGender() != null, Emp::getGender, param.getGender());
        luw.between(param.getBegin() != null && param.getEnd() != null, Emp::getEntryDate, param.getBegin(), param.getEnd());
        empPage = empService.page(empPage, luw);

        List<Emp> records = empPage.getRecords();
        //通过员工收集所有的部门id,通过map将,如果不为null，并且个数>0,在查询
        Set<Integer> deptIds = records.stream().map(Emp::getDeptId).filter(Objects::nonNull).collect(Collectors.toSet());
        if (deptIds != null && deptIds.size() > 0) {
            //从数据库中根据id门查询对用的名称  select * from dept where id in(1,2,3,4);
            List<Dept> depts = deptService.listByIds(deptIds);
            //将查询出来的进行转换，depts的每一个对象，变成map集合，key:部门的id,value:部门的名称
            //stream中的map是用来转换的
            Map<Integer, String> collect = depts.stream().collect(Collectors.toMap(Dept::getId, Dept::getName));
            for (Emp record : records) {
                record.setDeptName(collect.get(record.getDeptId()));
            }
        }
        // 返回结果
        PageResult<Emp> empPageResult = new PageResult<>(empPage.getTotal(), records);
        return Result.success(empPageResult);
    }

    @PostMapping
    public Result save(@RequestBody Emp emp) {
        log.info("新增员工，员工信息：{}", emp);

        // 调用service层方法保存员工信息和员工的工作经历信息
        empService.addEmp(emp);
        return Result.success();
    }

    @DeleteMapping
    public Result delete(@RequestParam List<Integer> ids) {
        log.info("批量删除学生，{}", ids);

        // 调用service层方法批量删除员工信息和员工工作经历信息
        empService.deleteByIds(ids);
        return Result.success();
    }

    @GetMapping("/{id}")
    public Result getById(@PathVariable Integer id) {
        log.info("根据ID查询员工信息，id：{}", id);
        Emp emp = empService.findById(id);
        return Result.success(emp);
    }

    @PutMapping
    public Result update(@RequestBody Emp emp) {
        log.info("修改员工信息，员工信息：{}", emp);
        empService.updateEmp(emp);
        // 调用service层方法修改员工信息
        return Result.success();
    }

    @GetMapping("/list")
    public Result list() {
        log.info("查询员工列表");
        // 调用service层方法查询员工列表
        return Result.success(empService.list());
    }
}
